Numbers 36:6

This, is the thing which Yahweh hath commanded, as to the daughters of Zelophehad saying: Unto whomsoever it may be good in their eyes, let them become wives, - save only unto the family of the tribe of their father, let them become wives.

Genesis 24:57-58

Then said they, We must call the young woman and ask at her mouth.

Numbers 36:12

Unto men from among the families of the son of Manasseh son of Joseph, became they wives, - and so their inheritance remained with the tribe of the family of their father.

Genesis 24:3

that I may put thee on oath, by Yahweh God of the heavens and God of the earth - That thou wilt not take a wife for my son, from among the daughters of the Canaanites in the midst of whom, I, am dwelling:

2 Corinthians 6:14

Be not getting diversely yoked with unbelievers; for what partnership have righteousness and lawlessness? Or what fellowship hath light with darkness?

Treasury of Scripture Knowledge

Summary

This is the thing which the LORD doth command concerning the daughters of Zelophehad, saying, Let them marry to whom they think best; only to the family of the tribe of their father shall they marry.

Bible References

Only to the family

Numbers 36:12
Unto men from among the families of the son of Manasseh son of Joseph, became they wives, - and so their inheritance remained with the tribe of the family of their father.
Genesis 24:3
that I may put thee on oath, by Yahweh God of the heavens and God of the earth - That thou wilt not take a wife for my son, from among the daughters of the Canaanites in the midst of whom, I, am dwelling:
2 Corinthians 6:14
Be not getting diversely yoked with unbelievers; for what partnership have righteousness and lawlessness? Or what fellowship hath light with darkness?